Two missiles, 2420 km apart, are launched at the same time and are headed towards each other. They pass after 1.5 hours. The average speed of one missile is twice that of the other. What is the average speed of each missile?

Answer 1

If the slower's speed is s km/hr, then their combined speed of approach is s+2s = 3s

So, since distance = speed * time,

3s * 3/2 = 2420

Answer 2

d1 + d2 = 2420.
V1*T1 + V2*T2 = 2420.
V2 = 2V1, T1 = T2 = 1.5 h.
V1*1.5 + 2V1*1.5 = 2420, V1 = ?.

V2 = 2V1.

Answer 3

Gape Horn